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Lanthanides Electronic Configuration

The element i...

Question

The element in which electrons are progressively filled in 4f - orbital are called
(a) actinoids (b) transition elements (c) Lanthanoids (d) halogens

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Solution

Answer: (c) Lanthanoids

The elements in which electrons are progressively filled in 4f- orbital are called lanthanoids, lanthanoids consist for elements from Z = 58 (Cerium ) to 71 (Lutetium).

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Q. The elements of the three transition series of the d - block are given below:

\begin{matrix} S c & T i & V & C r & M n & F e & C o & N i & C u & Z n Y & Z r & N b & M o & T c & R u & R h & R d & A g & C d L a & H f & T a & W & R e & O s & I r & P t & A u & H g \end{matrix}

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Q. The elements of the three transition series of the d - block are given below:

\begin{matrix} S c & T i & V & C r & M n & F e & C o & N i & C u & Z n Y & Z r & N b & M o & T c & R u & R h & R d & A g & C d L a & H f & T a & W & R e & O s & I r & P t & A u & H g \end{matrix}

In any transition series, as we move form left to right, the d - orbitals are progressively filled and their properties vary accordingly.
Which element do you expect to have the highest melting point?

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